- 行业: Mining
- Number of terms: 33118
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The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A limestone consisting predominantly (more than 50%) of recycled calcite particles of sand size; a consolidated calcareous sand. Compare: calcareous sandstone
Industry:Mining
A limestone consisting predominantly of detrital calcite particles of silt size; a consolidated calcareous silt.
Industry:Mining
A limestone containing an appreciable amount (but less than 50%) of clay; e.g., cement rock.
Industry:Mining
A limestone containing from 5% to 35% MgCO<sub>3</sub>. Compare: dolomitic limestone
Industry:Mining
A limestone formed by accumulation or precipitation in a freshwater lake, a stream, or a cave. It is often algal and sometimes nodular.
Industry:Mining
A limestone formed by direct chemical precipitation or by consolidation of calcareous ooze.
Industry:Mining
A limit recorder of the intensity of ground vibrations initiated by a quarry or opencast blast. It consists essentially of a level glass base on which a number of pins 1/4 in (0.64 cm) in diameter and of lengths ranging from 6 to 15 in (15 to 38 cm) are stood upright. The pins stand inside hollow steel rods so that each pin can fall over independently of the others. The longer the pin, the less energy required to topple it. In practice it has been accepted that if the shorter pins (up to 10 in or 25 cm) remain standing, then there is no possibility of structural damage to a building by a quarry blast.
Industry:Mining
A limit switch that cuts off power if a machine part is moved beyond its safe range.
Industry:Mining
A line (in a stressed body) at all points on which the corresponding principal stresses have the same direction.
Industry:Mining
